title: Sleep discrepancy, sleep complaint, and poor sleep among older adults.
abstract: OBJECTIVE
  Discrepancy between self-report- and actigraphy-measured sleep, often considered an artifact of measurement error, has been well documented among insomnia patients. Sleep problems are common among older adults, and this discrepancy may represent meaningful sleep-related phenomenon, which could have clinical and research significance.
  
  
  METHODS
  Sleep discrepancy was examined in 4 groups of older adults (N = 152, mean age = 71.93 years) based on sleep complaint versus no complaint and presence versus absence of insomnia symptoms. Participants completed the Beck Depression Inventory-second edition (BDI-II) and 14 nights of sleep diaries and actigraphy.
  
  
  RESULTS
  Controlling for covariates, group differences were found in the duration and frequency of discrepancy in sleep onset latency (SOLd) and wake after sleep onset (WASOd). Those with insomnia symptoms and complaints reported greater duration and frequency of WASOd than the other 3 groups. Quantities of SOLd and WASOd were related to BDI-II score and group status, indicating that sleep discrepancy has meaningful clinical correlates.
  
  
  CONCLUSIONS
  Discrepancy occurred across all groups but was pronounced among the group with both insomnia symptoms and complaints. This discrepancy may provide a means of quantifying and conceptualizing the transition from wake to sleep among older adults, particularly those with sleeping problems.
authors.affiliation: Department of Clinical and Health Psychology, University of Florida, Gainesville, FL 32610, USA.
authors.forename: Jacob M
authors.initials: JM
authors.lastname: Williams
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Kay
authors.forename: Meredeth
authors.initials: M
authors.lastname: Rowe
authors.forename: Christina S
authors.initials: CS
authors.lastname: McCrae
mesh_terms: D056044:Actigraphy; D000368:Aged; D003863:Depression / Q000453:epidemiology / Q000523:psychology; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D011569:Psychiatric Status Rating Scales; D057566:Self Report; D012737:Sex Factors; D012890:Sleep; D012893:Sleep Wake Disorders / Q000453:epidemiology* / Q000523:psychology
keywords: Depression; Insomnia; Older adults; Sleep; Sleep discrepancy